Synthesis of trifunctional ligands containing thiophosphoryl, pyridine and pyridine N-oxide donor groups

The trifunctional mixed donor ligands 2,6-[R2P(S)CH2]2C5H3N 1(R = Ph 1a, Tol 1b, n-Bu, 1c) and 2,6-[R2P(S)CH2]2C5H3NO 2(R = Ph 2a, Tol 2b, nBu, 2c) have been prepared and characterized by spectroscopic (MS, IR, NMR) techniques. The coordination chemistry of one derivative 1a has been examined and the complex {[Ph2P(S)CH2]2C5H3N}Ni(NO3)2 has been crystallized and characterized by single-crystal X-ray diffraction methods. The structure contains a six coordinate Ni(II) ion bonded to a tridentate ligand 1a with Ni–Npyr 2.110(3)A and Ni–S 2.481(1) and 2.402 (1)A , a bidentate nitrate anion and a monodentate NO3– anion.